In Windows systems, which group has full control of a share by default?

In Windows systems, the group that has full control of a share by default is the "Everyone" group. This group includes all users and accounts that can access the system, including guests and authenticated users. By default, the "Everyone" group is granted full control permission for shares unless specific security settings or configurations override this default behavior. This means that users belonging to this group can read, write, modify, and delete files within the shared resource.

Understanding the behavior of other groups can provide additional context. For instance, the "Guests" group typically has fewer privileges than "Everyone," as it is intended for users who are not authenticated and may not have full access to system resources. "Authenticated Local Users" generally refers to users who have logged onto the system but does not encompass all possible users accessing shared resources. The "Samba Share Service" is specific to Linux/Unix systems serving SMB shares and does not pertain to native Windows permissions.

Thus, recognizing that "Everyone" includes all potential users in a Windows environment clarifies why this group is assigned full control by default on shared resources.